Hostname: page-component-586b7cd67f-2brh9 Total loading time: 0 Render date: 2024-11-28T23:22:26.983Z Has data issue: false hasContentIssue false
  • English
  • Français

Evolution of mechano-chemistry and microstructure of a calcium aluminate-polymer composite: Part II. Mixing rate effects

Published online by Cambridge University Press:  31 January 2011

L. S. Tan ,
A. J. McHugh ,
M. A. Gülgün  and
W. M. Kriven
L. S. Tan
Affiliation:
Department of Chemical Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
A. J. McHugh
Affiliation:
Department of Chemical Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
M. A. Gülgün
Affiliation:
Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
W. M. Kriven
Affiliation:
Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
Get access

Abstract

Microstructure, microchemistry and mechanical properties of hardened macro-defect-free (MDF) composites processed at various rotor rates in a Banbury mixer were investigated. A quiescently formed calcium aluminate-polyvinyl alcohol composite served as a substitute for an unmixed system. Results from the Banbury studies in conjunction with microchemical analysis of the unmixed composite showed evidence that the polymer-particle interaction is a mechanically induced crosslinking reaction. The rate of the mechano-chemistry increases with mixing speeds. Scanning electron micrographs (SEM) and transmission electron micrographs (TEM) of hardened composites mixed for 15 min at 30, 50, 100, and 200 rpm indicate that much of the mechanical strength of MDF is due to the crosslinked interphase zones that blanket the cement grains. Stresses in the paste due to mixing can destroy the interphase layer, leading to a weaker hardened composite. Microchemical analysis revealed that the mechano-chemistry of the system did not vary with changes in the mixing conditions studied.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 7 , July 1996 , pp. 1739 - 1747
Copyright
Copyright © Materials Research Society 1996

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1.Birchall, J. D., Howard, A. J., and Kendall, K., Nature (London) 289, 388 (1981).CrossRefGoogle Scholar
2.Birchall, J. D., Howard, A. J., Kendall, K., and Raistrick, J.H., U.S. Patent 4410 366 (1983).Google Scholar
3.McHugh, A. J. and Tan, L. S., in Advanced Cementitious Systems: Mechanisms and Properties, edited by Glasser, F. P., McCarthy, G. J., Young, J.F., Mason, T. O., and Pratt, P. L. (Mater. Res. Soc. Symp. Proc. 245, Pittsburgh, PA, 1992), p. 185.Google Scholar
4.McHugh, A. J. and Tan, L. S., Adv. Cem. Bas. Mat. 1, 2 (1993).CrossRefGoogle Scholar
5.Russell, P. P., M. S. Thesis, University of Illinois (1991).Google Scholar
6.Gülgün, M.A., Kriven, W.M., Tan, L. S., and McHugh, A.J., J. Mater. Res. 10, 1746 (1995).CrossRefGoogle Scholar
7.Chremisinoff, N. P., Polymer Mixing and Extrusion Technology (Marcel Dekker, New York, 1987), Chap. 5.Google Scholar
8.Popoola, O. and Kriven, W. M., J. Mater. Res. 7, 1545 (1992).CrossRefGoogle Scholar
9.Popoola, O., Kriven, W. M., and Young, J. F., Ultramicroscopy 37, 318 (1991).CrossRefGoogle Scholar
10.Popoola, O. O., Kriven, W. M., and Young, J. F., J. Am. Ceram. Soc. 74, 1928 (1991).CrossRefGoogle Scholar
11.Gülgün, M.A., Popoola, O.O., and Kriven, W.M., J. Am. Ceram. Soc. 77, 531 (1994).CrossRefGoogle Scholar
12.Wachtman, J. B. Jr., Capps, W., and Mandel, J., J. Mater. 7, 188 (1972).Google Scholar
13.Tan, L. S. and McHugh, A. J., J. Mater. Sci. 31, (1996, in press).Google Scholar
14.Tan, L. S., Ph.D. Thesis, University of Illinois (1995).Google Scholar
15.Ballauff, M. and Wolf, B. A., Adv. Polym. Sci. 85, 2 (1988).Google Scholar
16.Rudin, A., The Elements of Polymer Science and Engineering (Academic Press, New York, 1987), Chap. 6.Google Scholar
17.Desai, P. G., Young, J. F., and Wool, R. P., in Advanced Cementi-tious Systems: Mechanisms and Properties, edited by Glaser, F. P., McCarthy, G. J., Young, J. F., Mason, T. O., and Pratt, P. L. (Mater. Res. Soc. Symp. Proc. 245, Pittsburgh, PA, 1992), p. 179.Google Scholar
18.Rodger, S. A., Brooks, S. A., Sinclair, W., Groves, G. W., and Double, D. D., J. Mater. Sci. 20, 2853 (1985).CrossRefGoogle Scholar
19.Casale, A. and Porter, R. S., Polymer Stress Reactions (Academic Press, New York, 1978), Vol. 1.Google Scholar
20.Pryor, W. A., Free Radicals (McGraw-Hill, New York, 1966), Chap. 2.Google Scholar
21.Poon, C. S. and Groves, G. W., J. Mater. Sci. 23, 657 (1988).CrossRefGoogle Scholar